Abstract
A method for measurement of two-dimensional temperature field in rarefied gas flow by two-line laser induced fluorescence is proposed. Temperature is determined from the ratio of the intensities of fluorescence, which are obtained by irradiation of two laser beams of different wave length. Use of a laser sheet and a high-sensitivity vidicon camera allows multiple-point measurements of temperature in the flow field. Effectiveness of this method is verified by its application to the determination of the temperature distribution of a supersonic free jet. It is found that the results obtained by P(16)/R(18) [514.720 nm] and P(26)/R(28) [514.942 nm] absorption lines in the transition of B3∏o+u(v'=43)←X1Σ+ 8(V"=0) can predict temper-ature below 300 K with reasonable accuracy.
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